Lamp



FIG. 1 is a front elevational view of a lamp showing my new design;

FIG. 2 is a side elevational view thereof, the opposite side being a mirror image;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof. 

The ornamental design for a lamp, as shown and described. 